The Pro Form Endurance 420 E elliptical cross trainer has a 7kg (15.4lbs) inertia enhanced flywheel & a stride length of 51cm (20'') for smoother sessions. The 20 digital levels of SMR Silent Magnetic Resistance allow you to work out at the right intensity level & you can select from 20 pre-set workout apps to vary sessions. The cross trainer is i Fit® Bluetooth® Smart enabled (subscription optional) & has a large LCD screen with a Watts meter that shows your stats during your session, including time, distance, pulse, calories, speed, rpm, resistance & watts. To measure your heart rate there are pulse grip sensors or you can use a Bluetooth Smart chest strap (not included) which connects to the built-in wireless receiver.